Automatic Classification of Audio Data
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1 Automatic Classification of Audio Data Carlos H. C. Lopes, Jaime D. Valle Jr. & Alessandro L. Koerich IEEE International Conference on Systems, Man and Cybernetics The Hague, The Netherlands October 2004
2 Motivation The amount of multimedia now available on line has created a surge for efficient tools to organize and manage such a huge amount of data. Digital music is one of the most important data types distributed in the web. How to effectively organize and process such large variety and quantity of musical data to allow efficient indexing, searching and retrieval is a real challenge.
3 Motivation At present, multimedia data is usually classified based on textual meta information. While such information is very useful for indexing, sorting, comparing and retrieval, it is manually generated. Extracting the information through an automatic and systematic process might overcome such problems.
4 Motivation
5 Proposal Musical genre is an important description that has been used to classify and characterize digital music and to organize the large collections available on the web Musical genres are categorical labels created by humans to characterize music clips. These characteristics are related to the instrumentation, rhythmic structure, and harmonic content of the music.
6 Novelty A novel approach for content based musical genre classification based on the combination of classifiers.
7 Content-Based Approach
8 Content-Based Approach
9 Overview
10 Feature Extraction We have considered the problem of content--based musical genre classification as a pattern classification problem. In such a way Extract relevant features from music clips Feature extraction is the process of representing a segment of audio by a compact but descriptive vector.
11 Feature Extraction Since digitized music in good sound quality has an 1MB/minute rate, it would be very time consuming to extract the feature vector from the whole music. In such a way feature extraction is carried out only on segments of the music clip. Three segments are chosen according to the duration and bit rate of the music.
12 Feature Extraction
13 Feature Extraction The feature set used in this paper was originally proposed by Tzanetakis et al Two different types of features: musical surface features: mean and average of the spectral centroid, flux, zero--crossing rate, and low energy. beat--related features: relative amplitudes and beats per minute. These features form 15--dimensional feature vectors.
14 Classification Problem The basic problem in musical genre classification is: Given a music clip represented by a feature vector X = (x 1 x 2... x D ) where D is the dimension of the vector, assign a class, i.e. a musical genre g G that best matches to the input vector.
15 Classification Instance--based method: k--nearest neighbor (knn) algorithm. A multilayer perceptron (MLP) classifier with one hidden layer trained with the backpropagation algorithm.
16 Combination The three feature vector are extracted from the same music clip. The output of the classifiers that take at the input each feature vector can be combined to optimize the classification performance. We have considered only the majority voting scheme.
17 Overview
18 Experimental Results Dataset: 414 music clips (207 rock, 207 classic) Training set: 208 samples Validation set: 82 samples Test set: 122 samples Three feature vectors were extracted from each music clip 1,242 feature vectors.
19 Experimental Results
20 Experimental Results
21 Experimental Results
22 Experimental Results
23 Conclusion Automatic musical genre classification is a difficult pattern recognition task. We have presented a novel approach to musical genre classification that combines three feature vectors extracted from different regions of music clips. The feature vectors are combined at classification level through the combination of the outputs of single classifiers.
24 Conclusion A slight improvement in the correct musical genre classification was achieved. The combination rule used is very simple. Future work will include other combination strategies that take into account the confidence scores provided by the classifiers as well as a rejection mechanism to further improve the reliability of the system.
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